Groups of schoolteachers maybe in English county (6)
I believe the answer is:
staffs
I believe this is a double definition.
'groups of schoolteachers maybe' is the first definition.
(more than one teaching staff)
'english county' is the second definition.
(short for Staffordshire)
'in' is the link.
(Other definitions for staffs that I've seen before include "Nineteenth century artist" , "West Midlands county (abbr)" , "County; provides with workers" , "sticks" , "Sceptres, county (abbr.)" .)